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Fig. 4.
Quantum yield q in the line 23P − 23S for the different pumping channels 11S → k3P (k = 3, 4, 5) with the accounting for spin-flip transitions. The lower horizontal axis is a redshift, the upper one is the frequency ν = ν23P, 23S/(1 + z) in GHz, where ν23P, 23S is the laboratory transition frequency.
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